title: Classification of tea category using a portable electronic nose based on an odor imaging sensor array.
abstract: A developed portable electronic nose (E-nose) based on an odor imaging sensor array was successfully used for classification of three different fermentation degrees of tea (i.e., green tea, black tea, and Oolong tea). The odor imaging sensor array was fabricated by printing nine dyes, including porphyrin and metalloporphyrins, on the hydrophobic porous membrane. A color change profile for each sample was obtained by differentiating the image of sensor array before and after exposure to tea's volatile organic compounds (VOCs). Multivariate analysis was used for the classification of tea categories, and linear discriminant analysis (LDA) achieved 100% classification rate by leave-one-out cross-validation (LOOCV). This study demonstrates that the E-nose based on odor imaging sensor array has a high potential in the classification of tea category according to different fermentation degrees.
authors.affiliation: School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China. q.s.chen@hotmail.com
authors.forename: Quansheng
authors.initials: Q
authors.lastname: Chen
authors.forename: Aiping
authors.initials: A
authors.lastname: Liu
authors.forename: Jiewen
authors.initials: J
authors.lastname: Zhao
authors.forename: Qin
authors.initials: Q
authors.lastname: Ouyang
mesh_terms: D003116:Color; D016002:Discriminant Analysis; D062609:Electronic Nose; D005285:Fermentation; D008665:Metalloporphyrins / Q000737:chemistry; D009812:Odorants / Q000032:analysis*; D011166:Porphyrins / Q000737:chemistry; D013662:Tea / Q000737:chemistry*; D055549:Volatile Organic Compounds / Q000737:chemistry
chemical_list: D008665:Metalloporphyrins; D011166:Porphyrins; D013662:Tea; D055549:Volatile Organic Compounds
keywords: Classification; Electronic nose; Multivariate calibration; Odor imaging sensor array; Tea